CN115467659A - Sound insulator structure and sound insulator assembly of compatible sound insulation effect and physical strength - Google Patents

Abstract

The invention discloses a sound insulator structure in the technical field of acoustic logging, which comprises a shell, wherein the bottom end of the shell is provided with a stop ring; the top end of the inner shell is rigidly connected with the top end of the outer shell, the bottom end of the inner shell extends into the inner hole of the outer shell and is arranged at a distance from the stop ring, and the inner shell is provided with a spiral gap which enables the bottom end of the inner shell to axially move under the action of axial force; the connector extends into the inner hole of the outer shell and is rigidly connected with the bottom end of the inner shell, and the connector is flexibly and hermetically connected with the stop ring; the elastic spacer bush is sleeved on the connector; the rigid spacer bush is sleeved on the elastic spacer bush, and the rigid spacer bush is arranged at a distance from the shell. The invention utilizes the space division principle to set the integral single-shell structure of the existing sound insulator into a telescopic double-shell structure, utilizes the time division principle, and sequentially realizes flexible connection for improving the sound insulation effect and rigid connection for improving the physical strength of the sound insulator through relative stretching of the inner shell and the outer shell, thereby realizing the compatibility of the sound insulation effect and the physical strength.

Description

Sound insulator structure and sound insulator assembly of compatible sound insulation effect and physical strength

Technical Field

The invention relates to the technical field of acoustic logging, in particular to a sound insulator structure.

Background

Acoustic logging techniques have been widely used in the field of oil and gas well detection. As shown in fig. 12, the acoustic caliper includes: the sound wave receiving module 30 comprises a sound wave transmitting module 20, a sound insulator module 10 and a sound wave receiving module 30 which are sequentially arranged along the axial direction, wherein the sound wave transmitting module 20 comprises one or more sound wave transmitting transducers, and the sound wave receiving module 30 comprises a plurality of sound wave receiving transducers arranged in an array; the acoustic transmitting transducer is capable of transmitting acoustic waves into the formation of the borehole, the acoustic waves are received by the acoustic receiving transducer after propagating in the formation surrounding the borehole, and the characteristics of the formation surrounding the borehole can be characterized and described by using the received acoustic signal characteristics, such as propagation time, frequency, amplitude, attenuation, and the like.

However, in actual production activities, the acoustic signals collected by the acoustic receiving transducer also include noise signals, which affect the accuracy of acoustic logging, and the noise signals are mainly direct wave signals (acoustic signals sent by the acoustic transmitting transducer of the acoustic caliper, transmitted through the housing of the tool, and collected by the acoustic receiving transducer of the acoustic logging tool), so a sound insulator module needs to be arranged between the acoustic transmitting module and the acoustic receiving module of the acoustic logging tool to reduce the influence of the direct wave signals on the acoustic logging.

As shown in fig. 13, the existing sound insulator structure generally adopts a design of attenuating sound wave signals by sound wave impedance variation, that is, U-shaped inner grooves 114 and outer grooves 113 are alternately arranged on the inner wall and the outer wall of the outer shell 110 of the sound insulator, and the depths of the inner grooves 114 and the outer grooves 113 are more than half of the wall thickness of the outer shell 110, so as to attenuate direct wave signals by sound wave impedance difference; meanwhile, in the length direction of the casing 110, the distance between the inner groove 114 and the outer groove 113 is less than a quarter of the wavelength of the main frequency of the sound wave signal, and the grooves of the inner groove 114 and the outer groove 113 can be filled with a high-density material, such as lead.

However, from a physical point of view, a phenomenon of stress sharply increasing, that is, a stress concentration phenomenon, occurs at a position where the cross-sectional dimension of the groove changes, and the physical strength (mechanical strength) of the housing gradually decreases as the depth of the groove increases; however, as the depth of the groove decreases, the sound insulation effect of the casing on the direct wave gradually deteriorates. In salvaging and retrieving the operation sound wave diameter measuring instrument, the sound insulator can bear torsional moment and axial tension simultaneously, and the biggest equivalent stress when only bearing torsional moment than the sound insulator increases a little, but the stress concentration position is unchangeable for the sound insulator can't bear the axial effort and damage.

Therefore, how to improve the sound insulation effect of the sound insulator and not reduce the physical strength of the sound insulator becomes a technical problem to be solved urgently.

Disclosure of Invention

In view of this, the present invention provides a sound insulator structure compatible with sound insulation effect and physical strength, so as to solve the technical problem that the existing sound insulator is incompatible with sound insulation effect and physical strength.

The technical scheme adopted by the invention is as follows: a sound insulator structure compatible with sound insulation effect and physical strength, the sound insulator structure comprising:

the bottom end of the shell is provided with a stop ring;

the top end of the inner shell is rigidly connected with the top end of the outer shell, the bottom end of the inner shell extends into the inner hole of the outer shell along the axial direction and is arranged at a distance from the stop ring, and a spiral gap which enables the bottom end of the inner shell to move axially under the action of axial force is arranged on the inner shell;

the top end of the connector extends into the inner hole of the outer shell along the axial direction and is rigidly connected with the bottom end of the inner shell, and the connector and the stop ring are flexibly sealed and axially connected in a sliding manner;

the elastic spacer bush is sleeved on the connecting head;

and the rigid spacer bush is sleeved on the elastic spacer bush, and two end faces of the rigid spacer bush are positioned between two end faces of the elastic spacer bush, so that the top end of the rigid spacer bush and the bottom end of the shell are arranged at a distance.

Preferably, the spiral slit is a double lead spiral slit, so that the inner shell can axially extend and contract under the action of axial force and the radial size of the inner shell is limited.

Preferably, the double-lead spiral gap is filled with elastic filler for attenuating direct wave signals; the inner shell is provided with a radial perforation for attenuating direct wave signals.

Preferably, the elastic filler and the elastic spacer are made of rubber and fluororubber with Shore hardness of 50 HA-110 HA.

Preferably, the top end of the inner shell is in threaded connection with the top end of the outer shell, and the bottom end of the inner shell is in threaded connection with the top end of the connector.

Preferably, the inner wall and the outer wall of the inner shell are both sprayed with elastic materials; the outer wall of the outer shell is coated with a glass fiber layer, and the radial distance between the inner shell and the outer shell is 0.010-0.100 inch.

Preferably, an O-ring is hermetically connected between the stop ring and the connector.

Preferably, the inner shell and the outer shell are made of stainless steel and nickel-based alloy, and the density of the rigid spacer bush is 1-3 times of that of the stainless steel.

The invention also provides a sound insulator assembly, which comprises the sound insulator structure compatible with the sound insulation effect and the physical strength, wherein the sound insulator structures are sequentially arranged along the axial direction, the bottom end of the connector is rigidly connected with the top end of the inner shell, the top end of the elastic spacer bush is abutted against the bottom end of the outer shell, the bottom end of the elastic spacer bush is abutted against the top end of the inner shell, and the bottom end of the rigid spacer bush is arranged at a distance from the top end of the inner shell.

Preferably, the first central hole of the inner shell and the second central hole of the connector are coaxially communicated to form an electrical lead hole, and pressure-resistant fluid is arranged in the electrical lead hole.

The invention has the beneficial effects that:

according to the invention, the space division principle is firstly utilized, the integral single-shell structure of the existing sound insulator is set into the telescopic double-shell structure, and then the time division principle is utilized, and the flexible connection for improving the sound insulation effect and the rigid connection for improving the physical strength of the sound insulator are realized in sequence through the relative telescopic of the inner shell and the outer shell, so that the compatibility of the sound insulation effect and the physical strength is realized, and the sound insulation effect and the physical strength of the sound insulator are ensured.

According to the invention, the inner shell is coaxially arranged in the cylindrical outer shell, the top end of the inner shell is rigidly connected with the top end of the outer shell, the bottom end of the inner shell is arranged at a distance from the stop ring at the bottom end of the outer shell, and the bottom end of the inner shell can axially move under the action of axial force by matching with the spiral gap arranged on the inner shell, so that the rigid connection and the interval connection between the bottom end of the inner shell and the bottom end of the outer shell are realized; then one end of the connector extends into the outer shell and is rigidly connected with the bottom end of the inner shell, and the connector is flexibly and hermetically connected with the stop ring, so that the connector and the outer shell can be switched between flexible connection and rigid connection; and finally, an elastic spacer bush is sleeved on the connecting head, a rigid spacer bush arranged at a distance from the bottom end of the outer shell is sleeved on the elastic spacer bush, the attenuation of sound waves can be realized through the elastic deformation of the elastic spacer bush, and the axial acting force is transmitted through the butting of the rigid spacer bush and the outer shell and the inner shell, so that the physical strength of the sound insulator is improved.

Drawings

FIG. 1 is a schematic structural diagram of a sound insulator structure compatible with sound insulation effect and physical strength according to the present invention;

FIG. 2 is a schematic perspective view of a sound insulator structure of the present invention having sound insulation effect and physical strength;

FIG. 3 is an exploded view of a sound insulator structure of the present invention having sound insulation effect and physical strength;

FIG. 4 is a schematic structural view of the housing;

FIG. 5 is a schematic perspective view of the inner shell;

FIG. 6 is a schematic structural view of the inner shell;

fig. 7 is a perspective view of the connection head;

FIG. 8 is a schematic view of the structure of the elastic spacer;

FIG. 9 is a schematic structural view of a rigid spacer;

FIG. 10 is a schematic view of the construction of a sound insulator assembly of the present invention;

FIG. 11 is a reference view showing a state of use of the sound insulator assembly of the present invention;

FIG. 12 is a schematic diagram of a prior art sonic caliper;

fig. 13 is a schematic structural view of a conventional sound insulator.

The reference numbers in the figures illustrate that:

10. a sound insulator module;

20. a sound wave emitting module;

30. sound wave receiving module

100. A sound insulator structure;

110. a housing;

111. a stop ring; 112. an internal thread connecting section; 113. an outer groove; 114. an inner groove;

120. an inner shell;

121. a spiral slit; 122. an elastic filler; 123. radially perforating; 124. a radial gap; 125. a telescoping gap; 126. the upper connecting threaded hole; 127. the lower connecting threaded hole; 128. a first central aperture;

130. a connector;

131. an installation section; 132. a lower connecting section; 133. an upper connecting section; 134. a second central aperture;

140. an elastic spacer sleeve;

141. a body portion; 142. a limiting boss;

150. a rigid spacer sleeve;

151. a connecting portion; 152. an annular abutment; 153. a first axial gap; 154. a second axial gap;

160. an O-shaped sealing ring;

170. an electrical feedthrough hole;

200. and a sound insulator assembly.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative, and not restrictive, of the invention.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

Examples, as shown in fig. 1 to 11, a sound insulator structure compatible with sound insulation effect and physical strength, which is used for attenuating direct wave signals and has high physical strength; this sound insulator structure 100 includes:

a housing 110, a stop ring 111 is fixedly connected to the bottom end of the housing 110.

And the top end of the inner shell 120 is rigidly connected with the top end of the outer shell 110, and the bottom end of the inner shell 120 extends into the inner hole of the outer shell 110 along the axial direction and is arranged at a distance from the stop ring 111, that is, an expansion gap 125 is formed between the bottom end of the inner shell 120 and the stop ring 111, and meanwhile, a spiral slit 121 enabling the bottom end of the inner shell 120 to move axially under the action of axial force is arranged on the inner shell 120.

A connector 130, a top end of the connector 130 extends into the inner hole of the outer shell 110 along the axial direction, and the top end of the connector 130 is rigidly connected with the bottom end of the inner shell 120, and the connector 130 is flexibly sealed and axially connected with the stop ring 111 in a sliding manner.

An elastic spacer 140, the elastic spacer 140 is sleeved on the connector 130.

And the rigid spacer 150 is sleeved on the elastic spacer 140, and two end faces of the rigid spacer 150 are positioned between two end faces of the elastic spacer 140, so that the top end of the rigid spacer 150 is arranged at a distance from the bottom end of the shell 110, and a first axial gap 153 is formed between the top end of the rigid spacer 150 and the bottom end of the shell 110.

This application utilizes the space earlier to cut apart the principle, sets the integral single-shell structure of current sound insulator into telescopic double-shell structure, recycles the time and cuts apart the principle, through the relative flexible of interior outer casing, successively realizes being used for improving the flexonics of sound insulation effect and the rigid connection who is used for improving physical strength, and then has realized the compatibility of sound insulation effect and physical strength, has guaranteed the sound insulation effect and the physical strength of sound insulator.

In this application, inner shell 120 sets up the inside at tube-shape outer shell 110, and the top of inner shell 120 and the top rigid connection of outer shell 110, the bottom of inner shell 120 and the 111 intervals settings of backstop ring of outer shell 110 bottom, the spiral slit 121 that sets up on the cooperation inner shell 120, make the bottom of inner shell 120 can be axial displacement under the axial force effect, also make inner shell 120 can be flexible at the axial force under the effect, and then the distance of the bottom of adjusting inner shell 120 and outer shell 110, thereby realize the rigid connection and the interval connection of the bottom of inner shell 120 and outer shell 110.

In the present application, one end of the connector 130 extends into the outer shell 110 and is rigidly connected to the bottom end of the inner shell 120, and the outer circumferential wall of the connector 130 is in flexible sealing connection with the stop ring 111, and the connector 130 moves axially, so that the axial force acting on the connector 130 can be transmitted to the inner shell 120, and the connector 130 and the outer shell 110 can be switched between flexible connection and rigid connection by the expansion and contraction of the inner shell 120.

In the present application, the elastic spacer 140 is sleeved on the connector 130, the top end of the elastic spacer 140 abuts against the bottom end of the housing 110, and the attenuation of the sound wave can be realized through the elastic deformation of the elastic spacer 140; and the elastic spacer 140 is also sleeved with a rigid spacer 150 which is arranged at a distance from the bottom end of the shell 110, when the elastic spacer 140 is compressed axially, after the top end of the rigid spacer 150 is abutted against the bottom end of the shell 110, the rigid spacer 150 can transmit axial acting force and improve the physical strength of the sound insulator.

In an embodiment, as shown in fig. 1, 2 and 4, the outer shell 110 is a cylindrical structure with two open ends, a stop ring 111 is integrally formed at the bottom end of the outer shell 110, and the inner diameter of the stop ring 111 is smaller than the inner diameter of the outer shell 110 and the outer diameter of the inner shell 120 and is larger than the outer diameter of the connecting head 130.

This is so set up because: the sound insulator of the present application is a telescopic double-shell structure, and the top end of the inner shell 120 is rigidly connected to the top end of the outer shell 110, so that when the inner shell 120 is subjected to an axial load and is axially stretched, the bottom end of the inner shell 120 moves axially. In this embodiment, a stop ring 111 is fixedly connected to the bottom end of the outer shell 110, and the inner diameter of the stop ring 111 is set to be smaller than the outer diameter of the inner shell 120, so that the bottom end of the inner shell 120 can abut against the stop ring 111 when moving axially, thereby realizing a rigid connection between the inner shell 120 and the outer shell 110 in the axial direction, and acting an axial tensile force acting on the sound insulator on the outer shell 110.

Preferably, the outer wall of the outer case 110 is coated with a glass fiber layer.

This is so set up because: in the present application, in order to improve the structural strength of the sound insulator, no recess is provided on the outer shell 110 of the sound insulator, which may cause the direct wave to propagate axially downward along the outer shell 110, and the direct wave signal on the outer shell 110 may be attenuated by adding an attenuation material on the outer shell 110. In the present embodiment, the outer circumferential surface (outer wall) of the housing 110 is wrapped with a glass fiber layer, because the glass fiber is an attenuation material for the acoustic wave, and the downward propagation of the direct wave can be attenuated by the attenuation of the acoustic wave by the glass fiber.

In one embodiment, as shown in fig. 1, 2, 5, and 6, a first central hole 128 is coaxially formed inside the inner housing 120, and the first central hole 128 axially penetrates both ends of the inner housing 120; the spiral slit 121 is provided around the axis of the inner casing 120 and communicates the circumferential side of the inner casing 120 and the first center hole 128, and the spiral slit 121 is a double lead spiral slit to allow the inner casing 120 to axially expand and contract under an axial force and to limit the radial dimension of the inner casing 120.

So set up because: firstly, the double-lead spiral gap can only change the axial dimension of the inner shell 120 under the action of an axial force, and the radial dimension does not change, so that a smaller gap is formed between the inner shell 120 and the outer shell 110, that is, the size of the radial gap 124 between the inner shell 120 and the outer shell 110 is kept unchanged, which is beneficial to increasing the radial dimensions of the inner shell 120 and the outer shell 110, and indirectly improving the physical strength of the sound insulator. However, the common single-lead spiral gap may change the radial dimension of the inner shell 120, and in severe cases, the inner shell 120 and the outer shell 110 may be rigidly connected in the radial direction, so that the sound insulator may not work. Secondly, the double-lead gap adjusts the gap between two adjacent spiral coils by utilizing the axial movement of the spiral coils of the inner shell 120, and the center distance cannot be changed, so that the axial expansion accuracy of the inner shell 120 can be maintained; however, in the conventional single spiral slit, the radial variation of the spiral coils of the inner casing 120 adjusts the gap between the spiral coils, which changes the center distance of the transmission and is not favorable for maintaining the precision of the axial expansion and contraction of the inner casing 120.

Preferably, the dual-lead spiral slot is filled with an elastic filler 122 for attenuating direct wave signals.

So set up because: attenuation of the acoustic signal occurs when the acoustic signal passes through the interface of two materials having a large difference in acoustic impedance. In this embodiment, the elastic filler 122 is filled in the dual-lead spiral gap, and the acoustic impedance of the elastic filler 122 is different from that of the inner shell 120, so that a large acoustic impedance change can be formed at the junction between the elastic filler 122 and the spiral coil of the inner shell 120, thereby realizing attenuation of direct wave signals; meanwhile, the elastic filler 122 belongs to a wave-absorbing material, which not only has a good absorption effect on the axially transmitted direct wave signal, but also is beneficial to restoring the inner shell 120 after the axial force disappears.

More preferably, the inner casing 120 is provided with a radial through hole 123 for attenuating the direct wave signal, that is, the radial through hole 123 is provided on the helical coil at the middle part of the inner casing 120, and the plurality of radial through holes 123 are sequentially arranged along the helical direction of the helical coil.

So set up because: after the axially propagating direct wave is attenuated by the dual-lead gap and the elastic filler 122, a part of the direct wave signal propagates downwards along the spiral coil of the inner housing 120, and although the propagation path of the acoustic wave is extended to attenuate the acoustic wave signal, a part of the direct wave signal still propagates downwards to the connector 130. In this embodiment, the radial through-holes 123 are formed on the spiral coil in the middle of the inner casing 120, so that the direct wave signal propagating along the spiral coil of the inner casing 120 can be attenuated by the change of the acoustic wave impedance.

In one embodiment, the material of the elastic filler 122 and the elastic spacer 140 is plastic material.

So set up because: the plastic material is durable, and the service life of the sound insulator can be effectively ensured.

Preferably, the elastic filler 122 and the elastic spacer 140 are made of rubber or fluororubber and have a shore hardness of 50HA to 110 HA.

So set up because: when the rubber or the fluororubber with the Shore hardness of 50 HA-110 HA is used, the sound insulation effect of the sound insulator is best.

In an embodiment, as shown in fig. 1, 2, 5, and 6, an external thread connection section is provided at the top end of the inner shell 120, an internal thread connection section 112 is provided at the top end of the inner wall of the outer shell 110, the inner shell 120 is coaxially installed in the outer shell 110, and the external thread connection section is in threaded connection with the internal thread connection section 112 to achieve rigid connection between the top end of the inner shell 120 and the top end of the outer shell 110. Meanwhile, the inner diameter of the female screw coupling segment 112 is smaller than that of the outer shell 110, so that the inner shell 120 and the outer shell 110 are spaced apart in the radial direction, and a radial gap 124 is formed between the inner shell 120 and the outer shell 110, and the size of the radial gap 124 is 0.010 inches to 0.100 inches.

So set up because: in this application, the sound insulator adopts double-shell structure, and outer shell 110 is used for strengthening the physical strength of sound insulator to bear higher axial effort and torsional moment, inner shell 120 adopts the flexible design of elasticity, with the sound insulation effect of reinforcing sound insulator, plays the purpose of decay direct wave signal. In this embodiment, the rigid connection between the top end of the inner shell 120 and the top end of the outer shell 110 is realized by adopting a threaded connection manner, and the inner shell 120 and the outer shell 110 are arranged at intervals in the radial direction, so that the rigid connection between the bottom end of the inner shell 120 and the outer shell 110 caused by the deformation of the inner shell 120 can be prevented, the smooth extension and contraction of the bottom end of the inner shell 120 can be ensured, the inner shell 120 is ensured to have a larger radial dimension, and the deformation of the inner shell 120 is further prevented.

Preferably, the inner wall and the outer wall of the inner case 120 are both coated with an elastic material.

So set up because: the elastic material sprayed on the outer wall and the outer wall of the inner shell 120 can further attenuate the direct wave signal, and meanwhile, after the inner shell 120 deforms seriously and abuts against the outer shell 110, the elastic material on the outer wall of the inner shell 120 can effectively prevent the direct wave signal on the outer shell 110 from being transmitted to the inner shell 120.

In one embodiment, as shown in fig. 1, 2, 6, and 7, an upper coupling screw hole 126 is provided at the top end of the inner housing 120 coaxially with the first center hole 128, and a lower coupling screw hole 127 is provided at the bottom end of the inner housing 120 coaxially with the first center hole 128; the connector 130 comprises an upper connecting section 133, a mounting section 131 and a lower connecting section 132 which are sequentially arranged along the axial direction, and the upper connecting section 133 and the lower connecting section 132 are both provided with external threads; the upper connecting section 133 of the connecting head 130 penetrates through the inner hole of the stop ring 111 and is screwed into the lower connecting threaded hole 127 at the bottom end of the inner shell 120, so as to realize rigid connection between the top end of the connecting head 130 and the bottom end of the inner shell 120; meanwhile, an annular mounting groove is formed in the inner hole of the stop ring 111, and a rubber O-ring 160 is mounted in the mounting groove, and the O-ring 160 is used for radial sealing between the stop ring 111 and the mounting section 131 of the coupler 130 and enables the coupler 130 to move axially.

This is so set up because: the connector 130 and the outer shell 110 are flexibly connected in the radial direction through the O-shaped sealing ring 160, and direct wave signals propagating downwards through the outer shell 110 can be attenuated through the wave absorbing effect of the O-shaped sealing ring 160 and the impedance change of sound waves at the junction; meanwhile, the top end of the connector 130 extends into the outer shell 110 and is rigidly connected with the bottom end of the inner shell 120, and the axial rigid connection between the inner shell 120 and the outer shell 110 can be realized through the axial movement of the connector 130; in addition, O-ring seal 160 also isolates the interior of housing 110 from the exterior to prevent the flow of water from the wellbore into the interior of the insulator.

Preferably, the first center hole 128 of the inner housing 120 and the second center hole 134 of the connector 130 are coaxially communicated, and an electrical lead hole 170 is formed for arrangement of the electrical cable.

In one embodiment, as shown in fig. 1, 8 and 9, the elastic spacer 140 includes a cylindrical body 141, and annular limiting bosses 142 are integrally formed at the top end and the bottom end of the body 141, an annular mounting groove is formed between the two limiting bosses 142 and the body 141, the rigid spacer 150 is mounted in the mounting groove, and both end faces of the rigid spacer 150 abut against the limiting bosses 142.

This is so set up because: after the rigid spacer 150 is sleeved on the elastic spacer 140, the limiting bosses 142 at the two ends of the elastic spacer 140 can limit the rigid spacer 150, so that when the sound insulator insulates the direct wave signal, a first axial gap 153 exists between the top end of the rigid spacer 150 and the bottom end of the outer shell 110, and a second axial gap 154 exists between the bottom end of the rigid spacer 150 and the top end of the inner shell 120, thereby ensuring a better sound insulation effect.

Preferably, the inner diameter of the elastic spacer 140 is smaller than the outer diameter of the connection head 130, so that the elastic spacer 140 is tightly sleeved on the connection head 130, and the top end of the elastic spacer 140 abuts against the bottom end of the stop ring 111, so as to achieve a double flexible sealing connection between the connection head 130 and the housing 110.

Preferably, the rigid spacer 150 includes a cylindrical connecting portion 151, and annular abutting portions 152 are integrally formed at the top end and the bottom end of the connecting portion 151, and the axial dimension of the annular abutting portions 152 is smaller than the axial dimension of the limiting bosses 142, so that after the rigid spacer 150 is fixedly mounted on the elastic spacer 140, the two ends of the rigid spacer 150 are spaced from the outer shell 110 and the inner shell 120.

In one embodiment, the inner shell 120 and the outer shell 110 are made of corrosion-resistant materials such as stainless steel and nickel-based alloy, and the density of the rigid spacer 150 is 1 to 3 times that of the stainless steel.

This is so set up because: when the sound insulator is subjected to axial pressure, the inner shell 120 contracts axially and drives the connector 130 to move axially, and the rigid spacer 150 extrudes the elastic spacer 140 and abuts against the outer shell 110, so that the axial rigid connection of the sound insulator can be realized, and the axial rigidity of the sound insulator can be improved. Meanwhile, when the direct wave signal propagates downward, the rigid spacer 150 may further attenuate the direct wave signal because the rigid spacer 150 is located between the upper and lower shells 110.

Preferably, the rigid spacer 150 may be made of tungsten carbide or lead.

In an embodiment, as shown in fig. 10, a sound insulator assembly for an acoustic logging tool includes a plurality of sound insulator structures 100 arranged in sequence along an axial direction, for example, five sound insulator structures 100 are arranged in sequence along the axial direction, and between two connected sound insulator structures 100, a lower connecting section 132 at a bottom end of a connecting head 130 is screwed into an upper connecting threaded hole 126 of an inner shell 120, and a top end of an elastic spacer 140 abuts against a bottom end of an outer shell 110, and a bottom end of the elastic spacer 140 abuts against a top end of an inner shell 120; the top end of the rigid spacer 150 is spaced from the bottom end of an outer shell 110 and defines a first axial gap 153, and the bottom end of the rigid spacer 150 is spaced from the top end of an inner shell 120 and defines a second axial gap 154.

So set up because: the bottom end of the connector 130 is rigidly connected with the top end of the inner shell 120, and the two end faces of the rigid spacer 150 are respectively arranged at intervals with the inner shell 120 and the outer shell 110, so that the axial rigid connection and the flexible connection between the adjacent sound insulator structures 100 can be realized through the axial movement of the connector 130; two end faces of the elastic spacer 140 are respectively abutted against the inner shell 120 and the outer shell 110, and the transmission of direct waves between the two connected sound insulator structures 100 can be attenuated through the wave absorption effect of the elastic spacer 140.

Preferably, the electrical feedthrough 170 is filled with a non-corrosive, pressure resistant fluid, i.e., the first central bore 128 of the inner housing 120 and the second central bore 134 of the connector 130 are filled with a pressure resistant fluid.

This is so set up because: the pressure-resistant fluid can inhibit corrosion inside the sound insulator and eliminate the influence of the hydrostatic pressure of the shaft (the hydrostatic pressure is too large, and the internal parts of the sound insulator can be damaged).

Preferably, the fluid resistant to pressure may be silicone oil.

The sound insulation principle of the sound insulator of the invention is as follows:

as shown in fig. 11, sound insulator assembly 200 of the present application can be used for blocking and isolating sound wave signals in a frequency band below 500Hz (low frequency) and above 10000Hz (high frequency), and can achieve attenuation of sound wave signals mainly by two methods. The first method of attenuation is acoustic impedance change attenuation, i.e., attenuation of an acoustic signal occurs when the acoustic signal passes through the interface of two materials having a large difference in acoustic impedance. A second method of attenuation is acoustic absorption, i.e., absorption of the acoustic energy occurs when the acoustic signal passes through a material that is conducive to absorbing vibrations.

For the attenuation and sound insulation treatment of high-frequency sound wave signals, the connection relation of parts is considered; for low-frequency signals, macroscopic analysis is needed, and it is noted that the wavelength of high-frequency sound waves may be as long as that of the instrument itself, and an integral design method is needed to evaluate the effectiveness of sound wave signal attenuation; in addition, increasing the roughness (e.g., irregular outer surfaces) of the instrument also helps to attenuate various acoustic signals propagating along the surface of the instrument.

When the sound wave emitting module 20 emits a high-frequency sound wave signal entering the sound insulator assembly 200 from the top end of the inner shell 120, the sound wave signal will simultaneously propagate downward along the inner shell 120 and the outer shell 110, and the sound wave signal propagating axially along the inner shell 120 will be attenuated by a plurality of interfaces between the inner shell 120 and the elastic filler 122; at the same time, the acoustic signal will continue to travel down the spiral coil of the inner housing 120, which will greatly increase the travel distance of the acoustic signal and also help to attenuate the acoustic signal. The acoustic signal propagating axially downward along the outer shell 110 needs to propagate radially through the O-ring 160 to the connector 130 and continue to propagate axially downward along the connector 130 to the inner shell 120; the wave absorbing effect of the O-ring 160 attenuates the propagation of the acoustic signal between the housing 110 and the connector 130. Part of the acoustic signal travels directly down the housing 110 axially, requiring two attenuating interfaces, elastic spacer 140 and rigid spacer 150, before it can travel to the housing 110 below.

When a high-frequency sound wave signal emitted by the sound wave emitting module 20 enters the sound insulator assembly 200 from the top end of the inner shell 120, the low-frequency sound wave signal tends to vibrate at a very long wavelength and act on the whole instrument, and the sound wave direct wave signal can be effectively blocked and attenuated by the absorption and attenuation effects of the elastic filler 122 and the elastic spacer 140 on the sound wave signal and the sound wave impedance change and attenuation effects of the inner shell 120 and the rigid spacer 150 on the sound wave signal.

The principle of enhancing the physical strength of the sound insulator of the invention is as follows:

when the acoustic tool becomes stuck in the wellbore and needs to be retrieved, the downhole tool stuck in the wellbore typically needs to withstand high axial loads (i.e., push-pull forces) which, in previous tool designs, typically result in significant damage or failure of the acoustic isolator member, and in the event of failure, additional fishing operations are required to remove the tool debris from the wellbore.

The sound insulator assembly 200 of the present application can enable the acoustic logging tool to bear a high axial load, as shown in fig. 10, when an axial compressive load is applied to the acoustic logging tool, the inner casing 120 will be compressed, the compression of the inner casing 120 will drive the axial movement of the connector 130, so as to gradually reduce the first axial gap 153 between the rigid spacer 150 and the outer casing 110, and simultaneously gradually reduce the second axial gap 154 between the rigid spacer 150 and the inner casing 120, until the two ends of the rigid spacer 150 abut against the outer casing 110 and the inner casing 120, respectively, so that the axial compressive load applied to the inner casing 120 acts on the rigid spacer 150 and the outer casing 110, the compression of the inner casing 120 is limited, and the elastic filler 122 is closely held on the inner casing 120, the inner casing 120 does not undergo plastic deformation, and the overall strength is increased.

When an axial tensile load is applied to the multiple acoustic logging unit, since the top end of the inner shell 120 is rigidly connected to the top end of the outer shell 110, the bottom end of the inner shell 120 can only move axially downward, so that the expansion gap 125 between the bottom end of the inner shell 120 and the stop ring 111 is gradually reduced until the bottom end of the inner shell 120 abuts against the stop ring 111, and the axial tensile load is applied to the outer shell 110, and the outer shell 110 and the connector 130 bear the axial tensile load, and at the same time, the inner shell 120 is not damaged due to excessive tension.

Under axial tension and compression loads, although the damping efficiency of the sound insulator is severely reduced, after the loads are released, the axial expansion and contraction of the inner shell 120 can release the rigid connection between the inner shell 120 and the outer shell 110, or separate the rigid spacer 150 from the inner shell 120 and the outer shell 110, so that the sound insulator assembly 200 can restore the sound insulation state.

Compared with the prior art, the method has the following beneficial technical effects:

the sound insulator structure in the application not only can effectively attenuate high-frequency longitudinal waves and low-frequency transverse waves, but also can bear axial tensile load and axial compression load of 100000 pounds.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims (10)

1. A sound insulator structure compatible with sound insulation effect and physical strength, characterized in that the sound insulator structure (100) comprises:

the bottom end of the shell (110) is provided with a stop ring (111);

the top end of the inner shell (120) is rigidly connected with the top end of the outer shell (110), the bottom end of the inner shell (120) extends into an inner hole of the outer shell (110) along the axial direction and is arranged at a distance from the stop ring (111), and a spiral gap (121) enabling the bottom end of the inner shell (120) to move axially under the action of axial force is arranged on the inner shell (120);

the top end of the connector (130) extends into the inner hole of the outer shell (110) along the axial direction and is rigidly connected with the bottom end of the inner shell (120), and the connector (130) is flexibly sealed and axially connected with the stop ring (111) in a sliding manner;

the elastic spacer bush (140), the elastic spacer bush (140) is sleeved on the connecting head (130);

the rigid spacer bush (150) is sleeved on the elastic spacer bush (140), and two end faces of the rigid spacer bush (150) are located between two end faces of the elastic spacer bush (140), so that the top end of the rigid spacer bush (150) and the bottom end of the shell (110) are arranged at a distance.

2. A sound insulator structure compatible with sound insulation effect and physical strength according to claim 1, wherein the spiral slit (210) is a double lead spiral slit so that the inner shell (120) can axially contract under an axial force and the radial dimension of the inner shell (120) is limited.

3. The sound insulator structure compatible with sound insulation effect and physical strength according to claim 2, wherein the double-lead spiral gap is filled with an elastic filler (122) for attenuating direct wave signals; the inner shell (120) is provided with a radial perforation (123) for attenuating direct wave signals.

4. The sound insulator structure compatible with sound insulation effect and physical strength according to claim 3, wherein the elastic filler (122) and the elastic spacer (140) are made of rubber and fluororubber with Shore hardness of 50 HA-110 HA.

5. A sound insulator structure compatible with sound insulation effect and physical strength according to claim 1, wherein the top end of the inner shell (120) is screwed with the top end of the outer shell (110), and the bottom end is screwed with the top end of the connector (130).

6. The sound insulator structure compatible with sound insulation effect and physical strength according to claim 1, wherein the inner wall and the outer wall of the inner shell (120) are coated with an elastic material; the outer wall of the outer shell (110) is coated with a glass fiber layer, and the radial distance between the inner shell (120) and the outer shell (110) is 0.010-0.100 inch.

7. A sound insulator structure compatible with sound insulation effect and physical strength according to claim 1, wherein an O-ring (160) is sealingly connected between the stop ring (111) and the connecting head (130).

8. The sound insulator structure compatible with sound insulation effect and physical strength according to claim 1, wherein the inner shell (120) and the outer shell (110) are made of stainless steel and nickel-based alloy, and the density of the rigid spacer (150) is 1-3 times that of the stainless steel.

9. A sound insulator assembly comprising the sound insulator structure compatible with sound insulation effect and physical strength according to any one of claims 1 to 8, wherein a plurality of the sound insulator structures (100) are sequentially arranged along an axial direction, the bottom end of the connecting head (130) is rigidly connected with the top end of the inner shell (120), the top end of the elastic spacer (140) abuts against the bottom end of the outer shell (110), the bottom end of the elastic spacer abuts against the top end of the inner shell (120), and the bottom end of the rigid spacer (150) is spaced from the top end of the inner shell (120).

10. A sound insulator assembly according to claim 9, wherein the first central bore (128) of the inner housing (120) and the second central bore (134) of the connector (130) are coaxially connected to form an electrical feedthrough (170), and wherein the electrical feedthrough (170) is filled with a pressure-resistant fluid.

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